It is indicated that the suction of air from the emergency ventilating shaft is the reason to cause the harmful hydraulic vibration.
研究表明，事故门井卷吸空气，形成明满交替流是造成一系列不良水力现象的前提。
2
The soft, pliable orange plastic darts have a nearly 2 inch long shaft and an approximately 1inch diameter suction cup.
这种柔软、易曲折的橙色塑料飞镖有接近2英寸的杆状物和一个大约直径为1英寸的吸盘。
3
The suction is provided by a suction unit of the side channel blower type, with direct coupling between the fan and the motor shaft and no transmission system.